>Can someone tell me the greatest amount of stops they have gotten
>with pt/pd? Or put it in terms of logs or DR, if that's how you do it.
I use the traditional formula, 100% Pt, no contrast agent, and you
can clearly see all 31 steps of a 3.05 wedge on the very smooth, very
white papers I favor. That is the exposure scale, of course -- the
print Dmax is generally 1.5 or so. I usually make negatives with a
DR of 3.1-3.2 for this process (which limits one's choice of films).